* Copper near 4-year high, boding well for 2018 growth
* Stocks up but iPhone X concerns weigh on tech
* Strong global growth expectations weigh on dollar (Updates to U.S. market open, changes byline and dateline, previous LONDON)
By Trevor Hunnicutt
Dec 27 (Reuters) - World stocks edged higher on Wednesday as a strong rally in copper buoyed expectations for a strong year for the global economy in 2018 and helped mitigate concerns over the technology sector triggered by reports of soft iPhone X demand.
Copper prices rocketed to multi-year highs, pushing the MSCI world equity index .MIWD00000PUS , which tracks shares in 47 countries, up 0.30 percent. The metal, used in construction and machinery, is seen as a proxy for global growth.
"The rally in copper supports expectations that 2018 is going to be a strong year for synchronized global growth," said Greg McKenna, chief strategist at AxiTrader.
Copper CMCU3 rose 1.29 percent to $7,217.00 a tonne, its highest in nearly four years, on expectations of robust demand from top consumer China in 2018. in Asia, Europe and the United States advanced, shaking off reports of lackluster demand for Apple Inc's AAPL.O iPhone X. Trading during the holiday week was thin, with many traders and investors away ahead of New Year's Day.
MSCI's broadest index of Asia-Pacific shares .MIAP00000PUS closed 0.25 percent higher. The pan-European FTSEurofirst 300 index .FTEU3 rose 0.09 percent. Emerging market stocks rose 0.53 percent.
Apple sagged 0.38 percent, one day after shares posted their worst single-day percentage fall since Aug. 10. The drop came after Taiwan's Economic Daily cited unidentified sources as saying Apple would slash its sales forecast for its flagship phone in the current quarter. DIPS
The Dow Jones Industrial Average .DJI rose 35.67 points, or 0.14 percent, to 24,781.88, the S&P 500 .SPX gained 4.36 points, or 0.16 percent, to 2,684.86 and the Nasdaq Composite .IXIC added 17.61 points, or 0.25 percent, to 6,953.86.
The dollar .DXY fell 0.28 percent against a basket of major currencies as commodity-linked currencies gained and as traders bet improved global growth would spur major central banks to begin reducing monetary stimulus in 2018. crude CLcv1 fell 0.52 percent to $59.66 per barrel and Brent LCOcv1 was last at $66.02, down 0.66 percent after moving to multi-year highs a day earlier on supply concerns. O/R
Though stocks inched up, there was an undercurrent of nervousness in the market that pushed some investors into government bonds, pushing their yields lower.
Benchmark 10-year notes US10YT=RR last rose 7/32 in price to yield 2.443 percent, from 2.467 percent late on Tuesday.
"Geo-political risks have notched a little higher, supporting rates markets," said Mizuho's head of rates Peter Chatwell, referring in particular to a renewal in tensions around North Korea.
The United States announced sanctions on two North Korean officials behind their country's ballistic missile program on Tuesday after the U.N. Security Council unanimously imposed new sanctions on North Korea last week. North Korean statement that U.N. sanctions are an act of war is, as tends to be the case, an exaggeration, but nevertheless, the market has no choice but to price it. Some safe-haven positioning is a natural reaction," said Chatwell.
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